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PVC to rigid

When going from pvc underground to rigid risers into panels on 480 volt system are the 2 lock nuts good enough to ensure the bonding of rigid pipe? KO is clean not eccen. or cocenn. I thought a bond bushing would be required because pipe run is not electrically continous from one end to other.

When going from pvc underground to rigid risers into panels on 480 volt system are the 2 lock nuts good enough to ensure the bonding of rigid pipe? KO is clean not eccen. or cocenn. I thought a bond bushing would be required because pipe run is not electrically continous from one end to other.